/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraGPUInstanceCountManager.h
Add a draw indirect task to generate the draw indirect args. Returns the draw indirect arg buffer offset.
[FIndirectArgSlot](API\Plugins\Niagara\FNiagaraGPUInstanceCountManager\FIndirectArgSlot) AddDrawIndirect ( [FRHICommandListBase](API\Runtime\RHI\FRHICommandListBase) & RHICmdList, uint32 InstanceCountBufferOffset, uint32 NumIndicesPerInstance, uint32 StartIndexLocation, bool bIsInstancedStereoEnabled, bool bCulled, [ENiagaraGpuComputeTickStage::Type](API\Plugins\Niagara\ENiagaraGpuComputeTickStage__Typ-) ReadyTickStage )